Does anyone know what size screws we should be using with the window motors?
Perhaps I’m over simplifying, but if you talking about the mounting screws, 10-24s or 10-32s of whatever length you need for your application is what we use.
Hope that’s what you needed. 
Bud Hayes
Mentor 2471
If you want to be super fancy, I think the metal plug in one of the mounting holes is #12-something. We usually drill them out to 1/4 inch and get it over with.